[gas mileage issues]

What was the exact code that came up? A clogged cat may cause the drop in MPG as does a bad O2 sensor.

Thanks, i think the code was a 420, maybe ch420 i can't exactly remember but it said it was the cat, but i was wondering about the o2, would it be the sensor right behind the cat? thanks again

[gas mileage issues]

I have a 2000 corolla CE and recently I dropped from about 40mpg highway to around 32mpg. The car was reading a check engine code and I checked it with a diagnostic computer that said it was a catalytic converter code that had come up twice. Could this be a problem with an o2 sensor or would replacing the catalytic converter bring my mpg's back up. I believe it is not the converter because the car only has 130k on it and this loss of mpg was kind of a sudden thing that coincided with the check engine light coming on. Thanks for any help. Jeff.

[manual transmission poping out of gear.]

hey, i have a 2000 corolla CE with a 5-speed transmission. when i put it in fourth gear it pops out randomly. i'm sure i put it all the way into gear and i'll be driving and it will just shoot out of gear. Does anyone know what could be causing this to happen. thanks, Jeff.

[How do I increase the mileage in my 2000 Corolla?]

Welcome to TOC!

2000 Corolla are very nice cars.

To get even better mileage - there is all the usual things to do.

Increase tire pressure, reduce unnecessary weight in your car, etc.

As per performance mods to increase mileage - an exhaust frees up the restriction so your engine does not have to work harder, instead of an air filter replacement you can get a SRI which allows the engine to breathe in air easier.

Keep in mind by making your engine more efficient, you will tempted to hammer down the accelerator thereby negating your mileage increase.

Thanks a lot for the tips, i was wondering if exhaust would improve the mileage, i know that on some newer models a less restrictive exhaust will actually hurt mpg because of the back-pressure. what is a "SRI"? thanks again.

[How do I increase the mileage in my 2000 Corolla?]

I just bought a 2000 Corolla 5-speed and it is getting about 35mpg on the highway. what are some ways i can increase the gas mileage? i was thinking about a k&n stock air filter replacement. are there any other good tips? thanks. i'm new to this forum so i'm not sure how it works.